Hydraulic apparatus



Feb. 16, 1943. R. w. KEELER HYDRAULIC APPARATUS Original Filed July 27,-1935 WW A Zhwentor RAYMOND W KEELE 2,

BY W 7. mm

(Ittomeg Patented Feb. 16, 1943 HYDRAULIC APPARATUS Raymond W. Kceler,Galion, Ohio, assignor to The Galion Iron Works & Manufacturing Company,a corporation of Ohio i'Originail application July 27, '1935, Serial No.33,543, now Patent No. 2,171,255, dated August 29, 1939. Divided andthis application February 23, 1939, Serial No. 257,814

1 Claim.

My invention relates to hydraulic apparatus for a portable road rollerof the type disclosed in my Patent No. 2,171,255, granted August 29,1939, and one of the objects of the invention is the provision ofimproved and efficient pump structure particularly adapted for use insuch hydraulic apparatus.

Other objects of the invention will appear hereinafter, the novelfeatures and combinations being set forth in the appended claim.

In the accompanying drawing:

Fig. 1 is a. sectional elevational view of the combined reservoir, valveand double acting pump of the hydraulic system;

Fig.2 is an elevational view partly in section of the left-hand side ofthe mechanism shown in Fig. 3;

Fig. 3 is a sectional plan view taken on the line 3-3 of Fig. 3 lookingin the direction'of the arrows;

Fig. 4 is a sectional plan view taken on the line 4-4 of Fig, 4 lookingin the direction of the arrows;

Fig. 5 is an enlarged sectional elevational view taken on the line 5-5of Fig. 6 looking in the direction of the arrows; and

Fig. 6 is a diagrammatic piping diagram of the hydraulic system.

This application is a division of my application for Portable roadrollers, Serial No. 33,543, filed July 27, 1935, now Patent No.2,171,255, granted August 29, 1939, and reference is made to thatapplication for a disclosure of structural details not hereinspecifically disclosed.

Referring particularly to Figs. 1 and 6 of the drawing, attention is nowdirected to a hydraulic control system for controlling the elongatedhydraulic motor or jack 56, 58 which is pivotally connected at its endsby the main frame and the supplemental frame as shown in said Patent2,171,255. Mounted on the base 2l5' I provide mechanism 2l2 comprising amanually operable combination pump, reservoir and valve. Said mechanism2 l2 includes a lever 2l3 for controlling the valve mechanism whichcontrols the direction of flow of hydraulic fluid to and from thecylinder 58 of the hydraulic piston motor or jack shown'in Fig. 6.

The pressure medium is preferably oil which is placed in the casing 2I4,the latter serving as the liquid reservoir or source of supply of thepressure medium. This reservoir comprises a base 2l5' which receives acylinder 2" which is clamped between said base M5 and a cylinder isconnected to the upper end of a valve rod 2l9' which terminates in valve254 at the lower end thereof which valve 254 is slightly tapered orfrusto-conical in shape and is pressed upwardly by a spring 255 seatedin a screw cap 256 at the center of the bottom or base 2I5', as shown inFig. 1 of the drawing. 1

Fig. 3 is a sectional plan view on the line 3-3 of Fig. 1 and shows thatthe various passageways desired may be obtained by simple straight-lineboring in the base 215 and the ends of the bores closed by means ofscrew plugs, as illustrated at 251, 258, 259 and 268. Valve 254 is asimple twoway valve, as illustrated particularly in Fig. 6 of thedrawing.

An opening from the reservoir 2 l 4' leads downwardly through thepassageway 261 into the transverse passageway 262 to the valve 254,shown in closed position in Fig. 3. When the valve 254 isin the positionshown in Fig. 6, however, weight on the piston 51 will cause the liquidto move through the pipe 248 past the valve 254 and thence through thepassageways 262 and 26l into the reservoir 2M. At the same time liquidcan be drawn from the reservoir through the pipe 263 past the checkvalve 264, pipe 265, cylinder 266, past the check valve 261, pipe 268,pipe 269, past the valve 254 and pipe 246 into cylinder 58 above piston51. In other words, this circuit will be established from the reservoir2 I 4' to the upper portion of the cylinder 58 by suction from abovehead M6 by means of bolts 2l8'. The lever 2I3 the piston 51 whilepressure is exerted below the latter by the weight of the piston rod 56to force liquid into the reservoir 2M. However, if a road roller is onthe roadway and it is desired to lift the front end of the vehicle frameto elevate the hitching device preparatory to hooking it to the haulingtruck the alternately acting pumps shown in Figs. 2 and 6 may beoperated to force liquid into the cylinder 58 above the piston 51.

When the piston 210 is formed down by the lever 235 the check valve 264will be closed but the check valve 261 will be opened and liquid willtherefore be forced through the pipes 268, 269 and 246 to the cylinder58 above the piston 51. When the plunger 21!] is moved down, plunger210' moving up will close the check valve 211 and open the check valve212 to draw liquid from the reservoir 2M through the pipe 216, checkvalve 212 and pipe 213 into the cylinder 214. After the cylinder 214 hasbeen filled with liquid and the plunger 216' is at the upper limit ofits stroke, the reversal of the latter will close the check valve 212and open the check valve 21I. At the same time the upward movement ofthe plunger 210 will close the check valve 261 and open the check valve264. ll'he downward movement of the plunger 210 will force the liquidthrough the pipes 215, 269 and 246. It will thus be seen that upon eachdownward stroke of the plungers 210 and 210 liquid will be forced intothe cylinder 58 above the piston 51.

By changing the position of the valve 254 from that shown in Fig. 6 to aposition ninety degrees therefrom, the pipe 269 will be connected to thepipe 248 and the pipe 246 will be connected to the return passageway'262. Then upon operation of the manually operated pump each down-i Wardstroke of the plungers 21D and 210 will force liquid into the lower endof the cylinder 58 below the piston 51 while the liquid above it will bedischarged back into the reservoir. Movement of the valve 254 to theposition shown in Fig. 3 will lock the piston 51 in adjusted position inthe cylinder 58 and therefore hold the aforesaid main and supplementalframes in adjusted at the same time providing a very rugged andefiicient mechanism.

It is, of course, evident that to replenish any loss of hydraulicfiuidin the reservoir or container 2| 4' it is only necessary to removethe plug in the top 2H5 illustrated in Fig. 2 of the drawing.

Obviously those skilled in the art may make ment of my invention, what Idesire to secure by Letters Patent of the United States is:

As an article of manufacture, a base having a pair of pump cylinderreceiving openings adjacent an edge thereof, a valve receiving recessextending entirely through the approximate center of the bottom of thebase, horizontal intersecting straight line bores in said baseconnecting said pump cylinder receiving openings, an additionalhorizontal straight line bore through said recess and connected to eachof said first-named horizontal bores, each of the said bores beingformed from without said base inwardly. screw plugs for closing theouter ends of said bores at the outer sides of said base. a screw plugfor closing the bottom of the valve recess, a bore from the top of saidbase to the inner end of said additional bore, a fourth straight linehorizontal bore from without said base through said recess, anotherscrew plug for closing the outer end of said fourth bore at the outerside of 'said base, and a pair of horizontal straight line bores fromoutside of said base to said fourth bore on opposite sides of saidrecess, .the outer ends of said last-named bores being screw-threaded toreceive supply pipe connections leading to a motor, the bore from thetop of the base serving as a drain opening for liquid returned from suchmotor.

RAYMOND W. KEELER;

